I have to tell you I love this one. Free software LockNote allows you to write, save, and automatically encrypt and decrypt the notes you write from a stand-alone, no-installation-necessary program.
You can hide your serial numbers, passwords, phone numbers and everyday notes on a USB key safe place. Your informations will be encrypted using a password and most modern AES 256bit encryption technology.
LockNote works in a very cool way – each time you save a LockNote, it saves as document and application all-in-one. You can easily convert text files you already have by dragging them into LockNote. Each time you create a LockNote, you set a new password and you’re good to go. It’s a very simple and lightweight way to encrypt your data and notes. Sadly Windows only.Steganos. Privacy Software made easy.… how about the Linux version guys?
There are lots of encryption programs out there. There are lots of ways to hide your notes too. But fSekrit is also a little application that will take text, encrypt it, and wrap it up into a neat little file that you can run off a USB drive (or whatever). Again the program IS the file, and the developer has had to get around that little Windows limitation: an exe can’t save to itself. But it does work. More importantly, your data is pretty secure, as fSekrit uses 256-bit AES encryption. That’s not to say you are completely invisible though, as the app is still vulnerable to keyloggers, and a couple of very unlikely instances. But when you view your data, the text is only in RAM, so there is practically no drive footprint (except the exe, which no one is likely to penetrate).
I prefer Locknote but have a play and make up your own mind.